Ignore aud and sei NALus when parsing bitstream.
Ignore aud and sei NALus when parsing bitstream.

We currently don't know how to parse these NALus and we don't need
any information from them anyway so we might as well skip parsing them
and not break.

BUG=chromium:697795

Review-Url: https://codereview.webrtc.org/2732623002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#17057}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: dea7f4f46f3d75eb01bad17537c3df2ce9ec4115

Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk